Circuit interrupter



Jan. 3, 1928.

w. o. LUM

CIRCUIT INTERRUPTER Filed Dec. 2, 1924 0 R m 5 N a 5 w M Am UWMQUA Patented Jan. 3,1928.

UNITED STATES PATENT OFFICE;

WALTER O. LUM, OF NEW YORK, N. Y., ASSIGNOR TO BLO-DRY INCORPORATED, OF

' SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK.

' CIRCUIT INTERRUP'IER.

Application filed December 2, 1924. Serial No. 753,473.

' My invention relates to improvements in circuit interrupters and it is an object of my invention to create a manually operated switch which will function to cause an electric motor to start and after the motor has made a certain number of rotations the switch will automatically open, but it is my purpose, in the design of my device, to provide a flexible play in the mechanism of my device so that the current being interrupted and the motor running on its own momentum there will nevertheless occur no strain or tension on the parts of my device and in this way I accomplish. the object of eliminating wear and tear on the switch and increase the life of same.

It is a further object of my invention, however, to provide that when the motor and the interrupter drive mechanism finally does come to rest, having provided flexibility, as aforesaid, that I will nevertheless also have provided that an immediate pickup will take place upon any successive operation. In other words, that at all times my device when operated will give immediate operation to the motor.

The further object of my invention is to design a device of this type which will ac- 'complish these purposes and at the same time be rugged and have a low cost to manufacture.

In order that my invention may be more fully understood reference is made to the accompanying drawings in which like letters refer to like parts.

In Figure 1, I show a side elevation of my device whilst in Figure 9, I show an end view of my device.

Figures 2 to 8 show the various components of the device which are shown assembled in Figure 1. These components are respectively a screw, washer, an arm, a washer, a spring, a hub and a disc.

Figure 4;, shows the side and front elevation of an arm.

Figure 7, shows a side and front elevation of the hub.

Figure 8, shows a side and front elevation of the disc.

Referring to Figure 1, A F is a motor drive shaft which drives through the screw A and rotates the arm C through the driving spring G by reason of the fact that the protrusion D in the arm O engages with the portion of the spring marked I which has a tendency to wind the spring G and creates tension on the spring so that the portion thereof marked H which is anchored about the protrusion on the disc I\ marked A I) results in turning and rotating the disc N. A E is a washer mounted on the hub K at L whilst J is the other shoulder for the disc N, the disc IT being mounted on the hub 15. The hole in the hub K at M is provided to ta re the screw A. The washers B and F hold the arm C in position, the hole E in the arm C being provided for the screw A, the hole P in the disc N being provided for the washer K whilst the marking O on the disc N shows the positioning for the attaching point of the protrusion A D to which is anchored portion H of the spring G whilst the notches R and Q, in the main disc N are provided to take the end of the arm roller Referring to Figure 9, W is a section of a mechanical switch arm which is manually operated by a button or otherwise in an in and out direction as shown by the arrow. This connects by the cotter pin V to the U- shaped bracket connection U to the arm 1, the other end of which arm contains the portion S which slides about the disc N during operation. T is connected to a small shaft X which operates the arm A A shown in a closed position; Y being a stationary cont actor and'Z being a movable contactor. A C shows the movable contactor in an open position and A B shows the arm A A in an open posit-ion. It will now appear that the operation of my device would be as follows:

Assuming that the motor is in a stop po sition the switch conthctors X and Y are open, the end portion S of arm Y is engaged with the notch Q or the notch R of the disc N. A momentary pressure upon the switch arm IV causes the arm T to rotate on X bringing S out of engagement with the notch Q, or R, as the case may be, and closing the eontactors X and Y which close the motor circuit and energize the motor. The motor Starts and by means of gear reduction or other mechanical advantage causes the interrupter arm A F to rotate which in turn immediately causes the arm C to rotate in the same direction whereupon the protrusion I) in the arm C engages the spring at I and causes the spring to pull against the plug A D and causes the disc N to rotate, pulling the notch Q out of register with the portion S and revolving the disc N whilst the pertion S slides about the disc N until the opposite notch R comes into register with S whereupon S drops down into R and opens the contactors Y and Z and thereby opens the motor circuit. The motor then revolves on its own momentum and has a tendency to carry the arm G and protrusion D and the spring portion I around with it. The only effect of which is to tighten up on the spring G, the protrusion A D, however, being, during that time, stationary. It will be seen that the motor having finally come to rest no part of my interrupter has been subjected to an undue strain butnevertheless it is in a position to immediately respond to a subsequent operation of switch arm \V. lVhile the disclosure herein set forth is one preferred embodiment of my invention, other mechanical arrangements are possible and must be understood to be within the scope of my invention.

Having thus described my invention what I claim and desire to secure by United States Letters Patent is:

1. In a circuit interrupter the combination of a manually closing contactor switch with a notched cylindrical disc as a holding means mounted upon a shaft and having an axial extension in the outward portion of said disc, a switch lever arm mounted on said shaft having an axial extension and a spring connected with said disc protrusion and in engagement with said lever arm protrusion,

all as and for the purposes hereinbefore set forth.

2. In a circuit interrupter the combination of a manually closing contactor switch with a notched cylindrical disc as a holding means mounted upon a shaft and having an axial extension in the outward portion of said disc, a switch lever arm mounted on said shafthaving an axial extension and a spring connected with said disc protrusion and in engagement with said lever arm protrusion, said spring being tensioned about said shaft,

all as and for the purposes hereinbefore set' forth. r

8. In a circuitinterrupter the combination of a manually closing contactor switch with a rocker arm, a notched cylindrical disc as a holdingmeans in engagement with one end of said rocker arm a disc and hub, an axial protrusion from said disc, a switch lever arm, an axial protrusion on said switch lever arm, switch lever arm washers and screw fastenings, said disc, hub and arm all mounted on a shaft, a spring tensioned about said shaft, one end of said spring connected with said disc protrusion and the other end of said spring engaged with said spring lever arm protrusion, all as and for the purposes hereinbefore set forth.

In witness whereof I have hereto signed my name this 19th day of September, 1924.

WALTER O. LUM. 

